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The hydrolytic polymerization of Cr~(3+) in the presence of maleic acid was studied byequilibrium pH method at 60℃ and constant ionic strength. Both maleic acid and Cr~(3+) are of threedifferent concentrations: 0.006, 0.008, 0.01 mol·L~(-1). The state of Cr~(3+) in aqueous solution weredetermined by graphical method and pqr analysis. The following species were found (CrA)~+, Cr-(OH)A and Cr_2(OH)_2A_2. The results by graphical method were revised by computer calculation withdata of about fifty experimental points. Hydrolysis constants of all species were obtained with goodfitting. It is obvious that the results obtained by program LEMIT are more accurate than thoseby graphical method. Mechanism of Cr~(3+) polymerization in the presence of maleic acid is alsodiscussed.
The hydrolytic polymerization of Cr ~ (3+) in the presence of maleic acid was studied by equilibrium pH method at 60 ° C and constant ionic strength. Both maleic acid and Cr ~ (3+) are of threedifferent concentrations: 0.006, 0.008, 0.01 mol The state of Cr ~ (3+) in aqueous solution were determined by graphical method and pqr analysis. The following species were found (CrA) ~ +, Cr- (OH) A and Cr_2 (OH) _2A_2. The results by graphical method were revised by computer calculation with data of about fifty experimental points. Hydrolysis constants of all species were obtained with good fitting. It is obvious that the results obtained by program LEMIT are more accurate than thoseby graphical method. Mechanism of Cr ~ (3+) polymerization in the presence of maleic acid is alsodiscussed.